Mail Delivery Protection Act of 2007 - Prohibits the U.S. Postal Service from contracting for the delivery of mail on any route with one or more families per mile. Allows existing contracts to remain in effect until terminated by their terms and to be renewed one or more times. (Chapter 52 of title 39, U.S. Code, was repealed by P.L. 109-435, the Postal Accountability and Enhancement Act.)